Green anthraquinone dye.



UNITED STATES PATENT orrroa.

ROBERT E. SCHMIDT, OF ELBERFELD, GERMANY, 'ASSIGNOR TO FARBEN- FABRIKEN OF ELBERFELD CO, OF NEW YORK, N. Y., A CORPORATION OF NEW" YORK.

GREEN ANTHRAQUINONE DYE.

Specification of Letters Patent.

Patented Feb. 13, 1906.

Application filed September 8, 1905. Serial No. 277,586.

1'0 all w/wm/ it near concern.-

Be it known that I, ROBERT E. SCHMIDT, doctor of philosophy, chemist, residing at Varrcsbeckerstrasse 22 Elberfeld, Germany, (assignor to the FABBENFABRIKEN or ELBER- FELD 00., of New York) have invented a new and useful Improvement in Green Anthraquinone Dyestuffs and I hereby declare (R meaning an aryl-such as phenyl, tolyl, Xylyl, or the like.) By this process the sul- Baum is bluish green.

fonation takes place in the nucleus of the aryl group.

. sulfonic acid with primary aromatic amins.

The 1-4-8-trioxyanthraquinone sulfonic acid is obtained by heating 1-4-8-t'rioxyanthraquinone with sulfonating agents and boric acid.

The new dyestuff sulfonic acids are in the shape of their alkaline salts green powders" soluble in water with a green color and on.

heating in a solution of stannous chlorid in hydrochloric acid they are decomposed under the formation of the 1-4-8-trioxyanthr2iqui none sulfonic acid. They dye unmordanted and chrome mordanted wool green shades.

In carrying out the process practically I can proceed as follows, the parts being by weight: Twenty parts of IA-di'para'tolyldiamido-8-oxyanthraquinone sulfonic'acid having probably the formula Nil-0 H,

are stirred into eighty parts of fuming sulfuric acid, (ten to twenty per cent. of S0 The mixture is stirred at from 30 to 50 centi grade until a test portion is easily soluble in cold water. The mass of the reaction is then mixed with three hundred parts of ice-water and the new dyestuff sulfonic acid is precipitated in the shape of a dark-green powder by the addition of common salt, filtered off, and

washed with a temper-cent. common-salt solution. The new product, which is most probably a disulfonic acid containing onesulfonic group in the anthra uinone nucleus and the other in the nucleus 0 the aryl group is in the sha e of its sodium salt a green powder solub e in water with a green color.

The solution in concentrated sulfuric acid 66 If the dyestuff is heated in a solution of stannous chloridli'n hydrochloric acid, it is decomposed under the formation of a leuco compound of thell-ltrioxyanthra uinone sulfonic acid. It dyes wool pure yel owish-green shades.

The process proceeds in an analogous manner on starting from other l-4-diaryldiamido- 8-oxyanthraquinone sulfonic acids contain ing the sulfonic group in the anthraquinone nucleus, such as the 1-4-diphenyldiamido-8- ox'yanthraquinone sulfonic acid or the like.

Having now described. my invention and in what manner the same is to be performed, what I claim as new, and desire to secure by Letters Patent, is

1. The herein-described'new dyestuff sulfonio acids obtainable by sulfonating 1-4-diaryldiarnido .8 oxyanthra uinone sulfonic acids containing the one sul fonic group prob.- ably in the anthraquinone nucleus and the ot her in the aryl nucleus, which (ilyestufls are,

in the shape of their alkaline salts green powders easily soluble in Water with it green color and on heating; in a solutionof stunnons ehlorid in lrvdrochloric acid they are deconi posed under the formation of the l4-8-trioxyanthraquinone sullonii" acid and dyeing wool green shades, substantially as described.

2. The lim'ein-deseril ed new dyestutl' suls tonic acid, obtainable by sulfonzitingl4-di pzu'etolyldia in ido S oxyanthrnquinone sulfonic acid containing the one snll'onic group probably in the anthra-quinone nucleus and he other in the benzol nucleus of the tolyl radical, which dyestulf is in the shape of its sodium salt it green powder soluble in water with a green color; being dissolved by c0ncentratet'l sulfuric acid of 66 Baum with a. bluish-green color and on heating in n solution of stannous chlorid in hydrochloric acid it is decomposed under the formation of the 1-4-S-trioxyanthraquinone sul'lonie acid; and dyeing Wool yellowish-green shades, substantially as described. i

In testimony whereof I have signed my name in the presence of two subscribing witnesses.

ROBERT E. SCHMIDT.

Vfitnesses:

OTTO KoNIG, J. A. RITTERSHAUS. 

